Gillibrand, a New York Democrat, has hired staff members and secured office space in anticipation of joining the 2020 race, where she would become part of a crowded Democratic field looking to knock off President Donald Trump.

Her Colbert appearance is scheduled to tape at 5:30 p.m. and air at 11:30 p.m.

Gillibrand's staff declined to discuss what she would address with Colbert on Tuesday night, but it wouldn't be the first time she has discussed her 2020 prospects with the late-night host.

"I believe right now that every one of us should figure out how we can do whatever we can with our time, with our talents to restore that moral decency, that moral compass and that truth of who we are as Americans, so I will promise you I will give it a long, hard thought of consideration," she said Nov. 8.

New York's junior senator

Sen. Kirsten Gillibrand speaks to supporters during an election night watch party hosted by the New York State Democratic Committee, Tuesday, Nov. 6, 2018, in New York.(Photo11: Mary Altaffer, AP)

An Albany native who now lives in nearby Brunswick, Gillibrand was first appointed to the Senate in 2009 after former Sen. Hillary Clinton was tapped to become President Barack Obama's secretary of state.

A gifted campaign fundraiser with more than $10 million on hand, Gillibrand has seen her national profile increase in recent years as she urged women to run for office and spoke out against sexual harassment and assault.

In recent years, Gillibrand has tried to appeal to liberal-minded voters by vowing not to accept campaign cash from corporate PACs. She's also made major headlines in November 2017, when she said President Bill Clinton should have resigned over his affair with Monica Lewinsky.

She has gotten office space in the Rensselaer County city of Troy, not far from her Brunswick home.

Crowded Democratic field

Gillibrand is expected to enter a Democratic primary field that already includes Massachusetts Sen. Elizabeth Warren, Hawaii Rep. Tusli Gabbard and former Housing Secretary Julian Castro, among others.

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Other high-profile Democrats are expected to announce their intentions in the coming weeks and months, including Vice President Joe Biden, who polls have shown as the early frontrunner for the Democratic nomination.

In a Democratic primary, Gillibrand will likely face renewed questions about many of her previous conservative-leaning positions, which once earned her an "A" rating from the National Rifle Association as a member of the House of Republicans from 2007 through early 2009.

Sen. Kirsten Gillibrand (D-NY), center, talks with Rep. Adriano Espaillat (D-NY) and Rep. Yvette Clarke (D-NY) during a post-midterm election meeting of Rev. Al Sharpton's National Action Network in the Kennedy Caucus Room at the Russell Senate Office Building on Capitol Hill Nov. 14, 2018 in Washington, DC. Politicians believed to be considering a run for the 2020 Democratic party nomination, including Sen. Elizabeth Warren (D-MA) and Sen. Kamala Harris (D-CA), addressed the network meeting as well as House members vying for leadership positions.= Chip Somodevilla, Getty Images

Sen. Jeanne Shaheen, D-N.H., left, and Sen. Kirsten Gillibrand, D-N.Y., right, listen to testimony during the Senate Armed Services Committee hearing on Capitol Hill in Washington, Thursday, Jan. 25, 2018, on global challenges and U.S. national security strategy. The witnesses were former Secretary of State Henry Kissinger, former Secretary of State George Shultz and former Deputy Secretary of State Richard Armitage. Susan Walsh, AP

The New York delegation cast their votes during roll call along with (Center L-R) New York City Mayor Bill De Blasio, Sen. Chuck Schumer (D-NY), Rep. Charles Rangel (D-NY), New York Gov. Andrew Cuomo, and Sen. Kirsten Gillibrand (D-NY), on the second day of the Democratic National Convention at the Wells Fargo Center, July 26, 2016 in Philadelphia, Pennsylvania. An estimated 50,000 people are expected in Philadelphia, including hundreds of protesters and members of the media. The four-day Democratic National Convention kicked off July 25. Joe Raedle, Getty Images

Calling it her proudest day in Congress, Sen. Kirsten Gillibrand (D-NY) (2nd L) embraces FealGood Foundation co-founder John Feal during a news conference with Sen. Chuck Schumer (D-NY) (R) after the Zadroga 9/11 health and compensation programs were included in the omnibus spending bill that passed Congress at the U.S. Capitol on Dec. 18, 2015 in Washington, DC. With a public awareness campaign lead by former Daily Show host Jon Stewart, the Zadroga legislation will provide money for healthcare for first responders and others suffering from diseases from the 9/11 attacks and for the families of those who have died. Chip Somodevilla, Getty Images

Senate subcommittee on Personnel Chair, Sen. Kirsten Gillibrand, D-N.Y., right, talks with former US Army Sgt. Rebekah Havrilla, on Capitol Hill in Washington, Wednesday, March 13, 2013, after Havrilla testified before the subcommittee's hearing on sexual assault in the military. Havrilla told the committee that she encountered a "broken" military criminal justice system after she was raped by another service member while serving in Afghanistan. Havrilla described suffering from post-traumatic stress disorder and described how her case was eventually closed after senior commanders decided not to pursue charges. Carolyn Kaster, AP

U.S. Sen. Kirsten Gillibrand (D-NY) holds her son Henry, 4, after greeting supporters at New York State Democratic Headquarters after she was predicted to win her election against Republican Wendy Long, Tuesday, Nov. 6, 2012, in New York. Kathy Willens, AP

In this May 18, 2009 file photo, first lady Michelle Obama, right, is joined by Sen. Kirsten Gillibrand, D-N.Y. during the ribbon cutting ceremony officially reopening the Charles Engelhard Court of the newly renovated American Wing at the Metropolitan Museum of Art in New York. Mary Altaffer, AP

House Speaker Nancy Pelosi, left, performs ceremonial swearing-in of Rep. Kirsten Gillibrand, D-N.Y., at the Capitol in Washington, on Thursday, Jan. 4, 2007. With her are her husband Jonathan and their son, Theodore. Members of the House were sworn in on the House floor earlier in the day. Heather Wines, Gannett News Service

Cuomo backs Biden

New York Gov. Andrew Cuomo, a fellow Democrat who once employed Gillibrand in the U.S. Department of Housing and Urban Development, has offered tepid support for the senator's presidential aspirations.

Earlier this month, Cuomo said he believes Biden has the "best case" for the Democratic nomination because he has "the secret ingredient you need to win, which is credibility."